Guide shell for rock drills



De. 17, 1935. J. c. CURTIS GUIDE SHELL FOR ROCK DRILLS Filed May 16, 1932 JOHN C. @CJ/ 775 INVENTOR ATTORNEY CII Patented Dec. 17,1935

PATENT oFFlcl;

.aozllaaz GUIDE SHELL non noon DRILLS John C. Curtis, Cleveland, Ohio, assigner to The Cleveland Rock Drill Company, Cleveland, Ohio, a corporationof Ohio Application May 16, 1932, Serial No. 611,555

3 Claims.

This invention relates broadly to rock drills, but is more particularly concerned with guide shells which serve as mountings for rock drills of the drifter type.

One of the objects of this invention is to produce a guide shell for rock drills comprising a restricted number of parts, thus reducing the cost oafV manufacture Yand maintenance.

Another object of this invention is to reduce the weight of the guide shell to a minimum and obtain a sturdy shell which willV be capable of Y withstanding the severe strains to which shells of this type are subjected.

Other objects and advantages more or less ancillary to the foregoing and the manner in which thevarious objects are attained reside in the specific .construction and aggroupment of the elements peculiar to this structure, as will become apparent from a more complete examination of this specification, in the claims of which there are assembled certain specific constructions indicative of the scope and spirit of the invention.

In theV drawing which illustrates a preferred embodiment of the invention:

Fig. l is a plan view of a guide shell assembly. Fig. 2 is a longitudinal sectional view of the guide shell taken in a plane indicated by line 2--2 in Fig. l.

Fig. 3 is a cross sectional view taken in a plane indicated by line 3-3 in Fig. l. Fig. 4 is a cross sectional View of the guide shell taken in a plane indicated by line li--d in Fig. 1. The'dot and dash lines indicate the position of the drilling motor when assembled with the guide shell.

Figs. 5, 6, and '7 are views similar to Fig. 4, illustrating modifications of the invention.

Fig. 8 is a cross sectional View taken in a plane indicated by line 8-8 in Fig. l.

Referring to the drawing in which likecharacters indicate corresponding parts throughout the several views, Ill represents the main member of the guide shell. This member is preferably obtained by machining a piece of rectangulartubing. The central portion of the upper wall of the tube Ill is cut away to provide a slot II extending approximately the full length of the tube. The remaining portions of that wall form two top plates I2, the purpose of which will be explained later. Adjacent these top plates, there is secured against each side wall of the tube I an L shaped angle plate I3, with the short side I4 extending inwardly in parallel alignment with the top plates II and forming therewith a. hannel'deifinng a groove I5 within (o1. 30s- 3) i which the anges I6 of the drill body Il, are free to slide. The angle plates may be secured to the tube by a .plurality of transversely disposed belts I9. To compensate for wear due to the longitudinal displacement of the drilling motors 5 flanges I6 within the grooves i5 and upon the side Iii, the width of the groove may be adjustable. For that purpose, the apertures provided in the angle plates I3 for allowingfthe passage of the bolts i9, are elongated as at 20, permit- 10 ting thereby the angle plate I3 to be moved toward or away from the top plate I2 and maintain thereby the width of the grooves I5 substantially equal'to the width of the anges I6. To provide for an even adjustment of the angle l5 plates, there isprovided on the respective engaging surfaces of the tube and the angle plates,

a plurality of longitudinally disposed teeth or serrations I8., which are parallel and in close relation with each other. When it is desired to reduce the width of the groove I5, the angle plate I3 may be moved upward a distance equal to the width of one tooth, thus aording a step by step adjustment of the angle plate I3.

Fig. 5 illustrates a modification of the inven- 25 tion in which the angle plates I3 are secured to the side walls of the tube I0, by spot welding the two together. This spot welding may be repeated at regular intervals along the entire length of the angle plates, assuring thereby a perfect integral assembly.

Fig. 6 illustrates another modication of the invention in which the angle plates I3 are positioned on the exterior of the tube Ill. In this instance the tube is made of a rectangular cross sectionbeing shorter in height than the tube illustrated in Fig. 4 and Fig. 5. The angle plates I3 may be secured to the side walls of the tube by means of `rivets 2l. 'Ihe side I4 of the angle plates I3rforms now the upper wall ofthe channel I5, while the remaining portion I2 of the upper wall of the tube, forms the lower wall of the channel.

Fig. 7 illustrates still another modification of the invention in which the mwer wan I4 of the 45 channel I5 is obtained by introducing within the rectangular tube I0 a smaller rectangular tube 22. The upper wall of this tube is provided with a out away portion defining a slot 23 corresponding to the slot II provided in the upper wall of the rectangular tube It. The tube 22 may be secured within the tube Id in any suitable manner, it may be welded, riveted, or bolted in place.

Toward the front end of the guide shell, a portion of the lower wall of the tube I0 is cut away, 55

thus forming a. rectangular opening adapted to receive the bottom wall 31 of a member 38 which is formed with two parallel side walls 25 disposed in straddle relation with the tube I0, for reinforcing and preventing the spreading of the side walls thereof. The member 3B is integrally welded to the tube I0, and is formed with a conical portion 24 depending therefrom by which the shell may be aaixed to anyv suitable support.

The extreme left end portion of the upper wall of the tube I0 is kept solid to prevent the spreading of the side walls of the tube toward that end. Mounted Within that same end of the tube I0, there is a bushing 26 being secured therein by a pair of transversely disposed bolts 2l. Rotatably mounted within the bushing 26 there is one end of a feed screw 28. The longitudinal displacement of the feed screw is prevented by its integral collar 36, and a handle 29, disposed in abutting relation with each end of the bushing 26. The handle 29 is secured on the feed screw 28 and is locked against relative rotation thereon by the co-operation of a clamping bolt 30. The other end of the feed screw 28 is journaled within a stationary bushing 3| secured within the right end of the tube t0 by a pair of bolts 32. To reinforce the extreme right end of the tube I0, there is welded thereon a band 33. The drilling motor is provided with an internal threaded portion 34 Within which the feed screw 28 is capable of engagement. Consequently, when the feed screw is rotated, its rotative movement is transformed into a longitudinal 'movement of the drilling motor Within the channels I5. To reduce the weight of the assembly, the bottom wall of the tube I0 is provided with a. plurality of openings or apertures 35.

Although the foregoing description is necessarily of adetailed character, in order to completely set forth the invention, it is to be understood that the specific terminology is not intended to be restrictive or confining and it is to be further understood that various rearrangements of parts and modification of structural detail may be resorted'to Without departing from the scope or spirit of the invention as herein claimed.

I claim:

l. A support for rock drill comprising an elongated shell of a rectangular cross section, adjustable guide ways within said shell within which the rock drill is slidably mounted, the upper wall of said shell being partly cut away to permit said rock drill to extend from said guide ways to the exterior of said shell, and a member having walls extending the full height of the shell secured thereto in straddle relation therewith to prevent the spreading of said guide ways, said member having a conical portion protruding from the lower wall of said shell for engagement with a supporting frame.

2. A guide shell for rock drill comprising a du- .d

ality of tubes of rectangular cross section disposed one within the other, a clearance between the upper wall of each of said tubes constituting guideways of rectangular cross section within which the corresponding guides of the rock drill are free to slide, and a slot Within the upper wall of one of said tubes allowing the passage of said guides into said guideways.

3f. A guide shell for rock drill comprising an external and an internal tube both of rectangular d cross section, the extent of the external height of said internal tube being less than that of the internal height of said external tube, providing thereby a clearance between the upperwall of each of said tubes constituting guideways of rectangular cross section within which the corresponding guides of the rock drill are free to slide, and a slot within the upper wall of said external tube through which the portion of the rock drill extending therefrom to said guides is free to slide.

JOHN C. CURTIS. 

